tools/sidxindex.c - manifest_repos/ffmpeg - Git at Google

 /*
  * Copyright (c) 2014 Martin Storsjo
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */

 #include <stdio.h>
 #include <string.h>

 #include "libavformat/avformat.h"
 #include "libavutil/avstring.h"
 #include "libavutil/intreadwrite.h"
 #include "libavutil/mathematics.h"

 static int usage(const char *argv0, int ret)
 {
     fprintf(stderr, "%s -out foo.mpd file1\n", argv0);
     return ret;
 }

 struct Track {
     const char *name;
     int64_t duration;
     int bitrate;
     int track_id;
     int is_audio, is_video;
     int width, height;
     int sample_rate, channels;
     int timescale;
     char codec_str[30];
     int64_t sidx_start, sidx_length;
 };

 struct Tracks {
     int nb_tracks;
     int64_t duration;
     struct Track **tracks;
     int multiple_tracks_per_file;
 };

 static void set_codec_str(AVCodecParameters *codecpar, char *str, int size)
 {
     switch (codecpar->codec_id) {
     case AV_CODEC_ID_H264:
         snprintf(str, size, "avc1");
         if (codecpar->extradata_size >= 4 && codecpar->extradata[0] == 1) {
             av_strlcatf(str, size, ".%02x%02x%02x",
                         codecpar->extradata[1], codecpar->extradata[2],
                         codecpar->extradata[3]);
         }
         break;
     case AV_CODEC_ID_AAC:
         snprintf(str, size, "mp4a.40"); // 0x40 is the mp4 object type for AAC
         if (codecpar->extradata_size >= 2) {
             int aot = codecpar->extradata[0] >> 3;
             if (aot == 31)
                 aot = ((AV_RB16(codecpar->extradata) >> 5) & 0x3f) + 32;
             av_strlcatf(str, size, ".%d", aot);
         }
         break;
     }
 }

 static int find_sidx(struct Tracks *tracks, int start_index,
                      const char *file)
 {
     int err = 0;
     AVIOContext *f = NULL;
     int i;

     if ((err = avio_open2(&f, file, AVIO_FLAG_READ, NULL, NULL)) < 0)
         goto fail;

     while (!f->eof_reached) {
         int64_t pos = avio_tell(f);
         int32_t size, tag;

         size = avio_rb32(f);
         tag  = avio_rb32(f);
         if (size < 8)
             break;
         if (tag == MKBETAG('s', 'i', 'd', 'x')) {
             for (i = start_index; i < tracks->nb_tracks; i++) {
                 struct Track *track = tracks->tracks[i];
                 if (!track->sidx_start) {
                     track->sidx_start  = pos;
                     track->sidx_length = size;
                 } else if (pos == track->sidx_start + track->sidx_length) {
                     track->sidx_length = pos + size - track->sidx_start;
                 }
             }
         }
         if (avio_seek(f, pos + size, SEEK_SET) != pos + size)
             break;
     }

 fail:
     if (f)
         avio_close(f);
     return err;
 }

 static int handle_file(struct Tracks *tracks, const char *file)
 {
     AVFormatContext *ctx = NULL;
     int err = 0, i, orig_tracks = tracks->nb_tracks;
     char errbuf[50], *ptr;
     struct Track *track;

     err = avformat_open_input(&ctx, file, NULL, NULL);
     if (err < 0) {
         av_strerror(err, errbuf, sizeof(errbuf));
         fprintf(stderr, "Unable to open %s: %s\n", file, errbuf);
         return 1;
     }

     err = avformat_find_stream_info(ctx, NULL);
     if (err < 0) {
         av_strerror(err, errbuf, sizeof(errbuf));
         fprintf(stderr, "Unable to identify %s: %s\n", file, errbuf);
         goto fail;
     }

     if (ctx->nb_streams < 1) {
         fprintf(stderr, "No streams found in %s\n", file);
         goto fail;
     }
     if (ctx->nb_streams > 1)
         tracks->multiple_tracks_per_file = 1;

     for (i = 0; i < ctx->nb_streams; i++) {
         struct Track **temp;
         AVStream *st = ctx->streams[i];

         if (st->codecpar->bit_rate == 0) {
             fprintf(stderr, "Skipping track %d in %s as it has zero bitrate\n",
                     st->id, file);
             continue;
         }

         track = av_mallocz(sizeof(*track));
         if (!track) {
             err = AVERROR(ENOMEM);
             goto fail;
         }
         temp = av_realloc_array(tracks->tracks, tracks->nb_tracks + 1,
                                 sizeof(*tracks->tracks));
         if (!temp) {
             av_free(track);
             err = AVERROR(ENOMEM);
             goto fail;
         }
         tracks->tracks = temp;
         tracks->tracks[tracks->nb_tracks] = track;

         track->name = file;
         if ((ptr = strrchr(file, '/')))
             track->name = ptr + 1;

         track->bitrate   = st->codecpar->bit_rate;
         track->track_id  = st->id;
         track->timescale = st->time_base.den;
         track->duration  = st->duration;
         track->is_audio  = st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO;
         track->is_video  = st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO;

         if (!track->is_audio && !track->is_video) {
             fprintf(stderr,
                     "Track %d in %s is neither video nor audio, skipping\n",
                     track->track_id, file);
             av_freep(&tracks->tracks[tracks->nb_tracks]);
             continue;
         }

         tracks->duration = FFMAX(tracks->duration,
                                  av_rescale_rnd(track->duration, AV_TIME_BASE,
                                                 track->timescale, AV_ROUND_UP));

         if (track->is_audio) {
             track->channels    = st->codecpar->channels;
             track->sample_rate = st->codecpar->sample_rate;
         }
         if (track->is_video) {
             track->width  = st->codecpar->width;
             track->height = st->codecpar->height;
         }
         set_codec_str(st->codecpar, track->codec_str, sizeof(track->codec_str));

         tracks->nb_tracks++;
     }

     avformat_close_input(&ctx);

     err = find_sidx(tracks, orig_tracks, file);

 fail:
     if (ctx)
         avformat_close_input(&ctx);
     return err;
 }

 static void write_time(FILE *out, int64_t time, int decimals, enum AVRounding round)
 {
     int seconds = time / AV_TIME_BASE;
     int fractions = time % AV_TIME_BASE;
     int minutes = seconds / 60;
     int hours = minutes / 60;
     fractions = av_rescale_rnd(fractions, pow(10, decimals), AV_TIME_BASE, round);
     seconds %= 60;
     minutes %= 60;
     fprintf(out, "PT");
     if (hours)
         fprintf(out, "%dH", hours);
     if (hours || minutes)
         fprintf(out, "%dM", minutes);
     fprintf(out, "%d.%0*dS", seconds, decimals, fractions);
 }

 static int output_mpd(struct Tracks *tracks, const char *filename)
 {
     FILE *out;
     int i, j, ret = 0;
     struct Track **adaptation_sets_buf[2] = { NULL };
     struct Track ***adaptation_sets;
     int nb_tracks_buf[2] = { 0 };
     int *nb_tracks;
     int set, nb_sets;

     if (!tracks->multiple_tracks_per_file) {
         adaptation_sets = adaptation_sets_buf;
         nb_tracks = nb_tracks_buf;
         nb_sets = 2;
         for (i = 0; i < 2; i++) {
             adaptation_sets[i] = av_malloc_array(tracks->nb_tracks, sizeof(*adaptation_sets[i]));
             if (!adaptation_sets[i]) {
                 ret = AVERROR(ENOMEM);
                 goto err;
             }
         }
         for (i = 0; i < tracks->nb_tracks; i++) {
             int set_index = -1;
             if (tracks->tracks[i]->is_video)
                 set_index = 0;
             else if (tracks->tracks[i]->is_audio)
                 set_index = 1;
             else
                 continue;
             adaptation_sets[set_index][nb_tracks[set_index]++] = tracks->tracks[i];
         }
     } else {
         adaptation_sets = &tracks->tracks;
         nb_tracks = &tracks->nb_tracks;
         nb_sets = 1;
     }

     out = fopen(filename, "w");
     if (!out) {
         ret = AVERROR(errno);
         perror(filename);
         return ret;
     }
     fprintf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
     fprintf(out, "<MPD xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n"
                 "\txmlns=\"urn:mpeg:dash:schema:mpd:2011\"\n"
                 "\txmlns:xlink=\"http://www.w3.org/1999/xlink\"\n"
                 "\txsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd\"\n"
                 "\tprofiles=\"urn:mpeg:dash:profile:isoff-on-demand:2011\"\n"
                 "\ttype=\"static\"\n");
     fprintf(out, "\tmediaPresentationDuration=\"");
     write_time(out, tracks->duration, 1, AV_ROUND_DOWN);
     fprintf(out, "\"\n");
     fprintf(out, "\tminBufferTime=\"PT5S\">\n");

     fprintf(out, "\t<Period start=\"PT0.0S\">\n");

     for (set = 0; set < nb_sets; set++) {
         if (nb_tracks[set] == 0)
             continue;
         fprintf(out, "\t\t<AdaptationSet segmentAlignment=\"true\">\n");
         if (nb_sets == 1) {
             for (i = 0; i < nb_tracks[set]; i++) {
                 struct Track *track = adaptation_sets[set][i];
                 if (strcmp(track->name, adaptation_sets[set][0]->name))
                     break;
                 fprintf(out, "\t\t\t<ContentComponent id=\"%d\" contentType=\"%s\" />\n", track->track_id, track->is_audio ? "audio" : "video");
             }
         }

         for (i = 0; i < nb_tracks[set]; ) {
             struct Track *first_track = adaptation_sets[set][i];
             int width = 0, height = 0, sample_rate = 0, channels = 0, bitrate = 0;
             fprintf(out, "\t\t\t<Representation id=\"%d\" codecs=\"", i);
             for (j = i; j < nb_tracks[set]; j++) {
                 struct Track *track = adaptation_sets[set][j];
                 if (strcmp(track->name, first_track->name))
                     break;
                 if (track->is_audio) {
                     sample_rate = track->sample_rate;
                     channels = track->channels;
                 }
                 if (track->is_video) {
                     width = track->width;
                     height = track->height;
                 }
                 bitrate += track->bitrate;
                 if (j > i)
                     fprintf(out, ",");
                 fprintf(out, "%s", track->codec_str);
             }
             fprintf(out, "\" mimeType=\"%s/mp4\" bandwidth=\"%d\"",
                     width ? "video" : "audio", bitrate);
             if (width > 0 && height > 0)
                 fprintf(out, " width=\"%d\" height=\"%d\"", width, height);
             if (sample_rate > 0)
                 fprintf(out, " audioSamplingRate=\"%d\"", sample_rate);
             fprintf(out, ">\n");
             if (channels > 0)
                 fprintf(out, "\t\t\t\t<AudioChannelConfiguration schemeIdUri=\"urn:mpeg:dash:23003:3:audio_channel_configuration:2011\" value=\"%d\" />\n", channels);
             fprintf(out, "\t\t\t\t<BaseURL>%s</BaseURL>\n", first_track->name);
             fprintf(out, "\t\t\t\t<SegmentBase indexRange=\"%"PRId64"-%"PRId64"\" />\n", first_track->sidx_start, first_track->sidx_start + first_track->sidx_length - 1);
             fprintf(out, "\t\t\t</Representation>\n");
             i = j;
         }
         fprintf(out, "\t\t</AdaptationSet>\n");
     }
     fprintf(out, "\t</Period>\n");
     fprintf(out, "</MPD>\n");

     fclose(out);
 err:
     for (i = 0; i < 2; i++)
         av_free(adaptation_sets_buf[i]);
     return ret;
 }

 static void clean_tracks(struct Tracks *tracks)
 {
     int i;
     for (i = 0; i < tracks->nb_tracks; i++) {
         av_freep(&tracks->tracks[i]);
     }
     av_freep(&tracks->tracks);
     tracks->nb_tracks = 0;
 }

 int main(int argc, char **argv)
 {
     const char *out = NULL;
     struct Tracks tracks = { 0 };
     int i;

     for (i = 1; i < argc; i++) {
         if (!strcmp(argv[i], "-out")) {
             out = argv[i + 1];
             i++;
         } else if (argv[i][0] == '-') {
             return usage(argv[0], 1);
         } else {
             if (handle_file(&tracks, argv[i]))
                 return 1;
         }
     }
     if (!tracks.nb_tracks || !out)
         return usage(argv[0], 1);

     output_mpd(&tracks, out);

     clean_tracks(&tracks);

     return 0;
 }
	/*
	* Copyright (c) 2014 Martin Storsjo
	*
	* This file is part of FFmpeg.
	*
	* FFmpeg is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2.1 of the License, or (at your option) any later version.
	*
	* FFmpeg is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with FFmpeg; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	#include <stdio.h>
	#include <string.h>

	#include "libavformat/avformat.h"
	#include "libavutil/avstring.h"
	#include "libavutil/intreadwrite.h"
	#include "libavutil/mathematics.h"

	static int usage(const char *argv0, int ret)
	{
	fprintf(stderr, "%s -out foo.mpd file1\n", argv0);
	return ret;
	}

	struct Track {
	const char *name;
	int64_t duration;
	int bitrate;
	int track_id;
	int is_audio, is_video;
	int width, height;
	int sample_rate, channels;
	int timescale;
	char codec_str[30];
	int64_t sidx_start, sidx_length;
	};

	struct Tracks {
	int nb_tracks;
	int64_t duration;
	struct Track **tracks;
	int multiple_tracks_per_file;
	};

	static void set_codec_str(AVCodecParameters codecpar, char str, int size)
	{
	switch (codecpar->codec_id) {
	case AV_CODEC_ID_H264:
	snprintf(str, size, "avc1");
	if (codecpar->extradata_size >= 4 && codecpar->extradata[0] == 1) {
	av_strlcatf(str, size, ".%02x%02x%02x",
	codecpar->extradata[1], codecpar->extradata[2],
	codecpar->extradata[3]);
	}
	break;
	case AV_CODEC_ID_AAC:
	snprintf(str, size, "mp4a.40"); // 0x40 is the mp4 object type for AAC
	if (codecpar->extradata_size >= 2) {
	int aot = codecpar->extradata[0] >> 3;
	if (aot == 31)
	aot = ((AV_RB16(codecpar->extradata) >> 5) & 0x3f) + 32;
	av_strlcatf(str, size, ".%d", aot);
	}
	break;
	}
	}

	static int find_sidx(struct Tracks *tracks, int start_index,
	const char *file)
	{
	int err = 0;
	AVIOContext *f = NULL;
	int i;

	if ((err = avio_open2(&f, file, AVIO_FLAG_READ, NULL, NULL)) < 0)
	goto fail;

	while (!f->eof_reached) {
	int64_t pos = avio_tell(f);
	int32_t size, tag;

	size = avio_rb32(f);
	tag = avio_rb32(f);
	if (size < 8)
	break;
	if (tag == MKBETAG('s', 'i', 'd', 'x')) {
	for (i = start_index; i < tracks->nb_tracks; i++) {
	struct Track *track = tracks->tracks[i];
	if (!track->sidx_start) {
	track->sidx_start = pos;
	track->sidx_length = size;
	} else if (pos == track->sidx_start + track->sidx_length) {
	track->sidx_length = pos + size - track->sidx_start;
	}
	}
	}
	if (avio_seek(f, pos + size, SEEK_SET) != pos + size)
	break;
	}

	fail:
	if (f)
	avio_close(f);
	return err;
	}

	static int handle_file(struct Tracks tracks, const char file)
	{
	AVFormatContext *ctx = NULL;
	int err = 0, i, orig_tracks = tracks->nb_tracks;
	char errbuf[50], *ptr;
	struct Track *track;

	err = avformat_open_input(&ctx, file, NULL, NULL);
	if (err < 0) {
	av_strerror(err, errbuf, sizeof(errbuf));
	fprintf(stderr, "Unable to open %s: %s\n", file, errbuf);
	return 1;
	}

	err = avformat_find_stream_info(ctx, NULL);
	if (err < 0) {
	av_strerror(err, errbuf, sizeof(errbuf));
	fprintf(stderr, "Unable to identify %s: %s\n", file, errbuf);
	goto fail;
	}

	if (ctx->nb_streams < 1) {
	fprintf(stderr, "No streams found in %s\n", file);
	goto fail;
	}
	if (ctx->nb_streams > 1)
	tracks->multiple_tracks_per_file = 1;

	for (i = 0; i < ctx->nb_streams; i++) {
	struct Track **temp;
	AVStream *st = ctx->streams[i];

	if (st->codecpar->bit_rate == 0) {
	fprintf(stderr, "Skipping track %d in %s as it has zero bitrate\n",
	st->id, file);
	continue;
	}

	track = av_mallocz(sizeof(*track));
	if (!track) {
	err = AVERROR(ENOMEM);
	goto fail;
	}
	temp = av_realloc_array(tracks->tracks, tracks->nb_tracks + 1,
	sizeof(*tracks->tracks));
	if (!temp) {
	av_free(track);
	err = AVERROR(ENOMEM);
	goto fail;
	}
	tracks->tracks = temp;
	tracks->tracks[tracks->nb_tracks] = track;

	track->name = file;
	if ((ptr = strrchr(file, '/')))
	track->name = ptr + 1;

	track->bitrate = st->codecpar->bit_rate;
	track->track_id = st->id;
	track->timescale = st->time_base.den;
	track->duration = st->duration;
	track->is_audio = st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO;
	track->is_video = st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO;

	if (!track->is_audio && !track->is_video) {
	fprintf(stderr,
	"Track %d in %s is neither video nor audio, skipping\n",
	track->track_id, file);
	av_freep(&tracks->tracks[tracks->nb_tracks]);
	continue;
	}

	tracks->duration = FFMAX(tracks->duration,
	av_rescale_rnd(track->duration, AV_TIME_BASE,
	track->timescale, AV_ROUND_UP));

	if (track->is_audio) {
	track->channels = st->codecpar->channels;
	track->sample_rate = st->codecpar->sample_rate;
	}
	if (track->is_video) {
	track->width = st->codecpar->width;
	track->height = st->codecpar->height;
	}
	set_codec_str(st->codecpar, track->codec_str, sizeof(track->codec_str));

	tracks->nb_tracks++;
	}

	avformat_close_input(&ctx);

	err = find_sidx(tracks, orig_tracks, file);

	fail:
	if (ctx)
	avformat_close_input(&ctx);
	return err;
	}

	static void write_time(FILE *out, int64_t time, int decimals, enum AVRounding round)
	{
	int seconds = time / AV_TIME_BASE;
	int fractions = time % AV_TIME_BASE;
	int minutes = seconds / 60;
	int hours = minutes / 60;
	fractions = av_rescale_rnd(fractions, pow(10, decimals), AV_TIME_BASE, round);
	seconds %= 60;
	minutes %= 60;
	fprintf(out, "PT");
	if (hours)
	fprintf(out, "%dH", hours);
	if (hours \|\| minutes)
	fprintf(out, "%dM", minutes);
	fprintf(out, "%d.%0*dS", seconds, decimals, fractions);
	}

	static int output_mpd(struct Tracks tracks, const char filename)
	{
	FILE *out;
	int i, j, ret = 0;
	struct Track **adaptation_sets_buf[2] = { NULL };
	struct Track ***adaptation_sets;
	int nb_tracks_buf[2] = { 0 };
	int *nb_tracks;
	int set, nb_sets;

	if (!tracks->multiple_tracks_per_file) {
	adaptation_sets = adaptation_sets_buf;
	nb_tracks = nb_tracks_buf;
	nb_sets = 2;
	for (i = 0; i < 2; i++) {
	adaptation_sets[i] = av_malloc_array(tracks->nb_tracks, sizeof(*adaptation_sets[i]));
	if (!adaptation_sets[i]) {
	ret = AVERROR(ENOMEM);
	goto err;
	}
	}
	for (i = 0; i < tracks->nb_tracks; i++) {
	int set_index = -1;
	if (tracks->tracks[i]->is_video)
	set_index = 0;
	else if (tracks->tracks[i]->is_audio)
	set_index = 1;
	else
	continue;
	adaptation_sets[set_index][nb_tracks[set_index]++] = tracks->tracks[i];
	}
	} else {
	adaptation_sets = &tracks->tracks;
	nb_tracks = &tracks->nb_tracks;
	nb_sets = 1;
	}

	out = fopen(filename, "w");
	if (!out) {
	ret = AVERROR(errno);
	perror(filename);
	return ret;
	}
	fprintf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
	fprintf(out, "<MPD xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n"
	"\txmlns=\"urn:mpeg:dash:schema:mpd:2011\"\n"
	"\txmlns:xlink=\"http://www.w3.org/1999/xlink\"\n"
	"\txsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd\"\n"
	"\tprofiles=\"urn:mpeg:dash:profile:isoff-on-demand:2011\"\n"
	"\ttype=\"static\"\n");
	fprintf(out, "\tmediaPresentationDuration=\"");
	write_time(out, tracks->duration, 1, AV_ROUND_DOWN);
	fprintf(out, "\"\n");
	fprintf(out, "\tminBufferTime=\"PT5S\">\n");

	fprintf(out, "\t<Period start=\"PT0.0S\">\n");

	for (set = 0; set < nb_sets; set++) {
	if (nb_tracks[set] == 0)
	continue;
	fprintf(out, "\t\t<AdaptationSet segmentAlignment=\"true\">\n");
	if (nb_sets == 1) {
	for (i = 0; i < nb_tracks[set]; i++) {
	struct Track *track = adaptation_sets[set][i];
	if (strcmp(track->name, adaptation_sets[set][0]->name))
	break;
	fprintf(out, "\t\t\t<ContentComponent id=\"%d\" contentType=\"%s\" />\n", track->track_id, track->is_audio ? "audio" : "video");
	}
	}

	for (i = 0; i < nb_tracks[set]; ) {
	struct Track *first_track = adaptation_sets[set][i];
	int width = 0, height = 0, sample_rate = 0, channels = 0, bitrate = 0;
	fprintf(out, "\t\t\t<Representation id=\"%d\" codecs=\"", i);
	for (j = i; j < nb_tracks[set]; j++) {
	struct Track *track = adaptation_sets[set][j];
	if (strcmp(track->name, first_track->name))
	break;
	if (track->is_audio) {
	sample_rate = track->sample_rate;
	channels = track->channels;
	}
	if (track->is_video) {
	width = track->width;
	height = track->height;
	}
	bitrate += track->bitrate;
	if (j > i)
	fprintf(out, ",");
	fprintf(out, "%s", track->codec_str);
	}
	fprintf(out, "\" mimeType=\"%s/mp4\" bandwidth=\"%d\"",
	width ? "video" : "audio", bitrate);
	if (width > 0 && height > 0)
	fprintf(out, " width=\"%d\" height=\"%d\"", width, height);
	if (sample_rate > 0)
	fprintf(out, " audioSamplingRate=\"%d\"", sample_rate);
	fprintf(out, ">\n");
	if (channels > 0)
	fprintf(out, "\t\t\t\t<AudioChannelConfiguration schemeIdUri=\"urn:mpeg:dash:23003:3:audio_channel_configuration:2011\" value=\"%d\" />\n", channels);
	fprintf(out, "\t\t\t\t<BaseURL>%s</BaseURL>\n", first_track->name);
	fprintf(out, "\t\t\t\t<SegmentBase indexRange=\"%"PRId64"-%"PRId64"\" />\n", first_track->sidx_start, first_track->sidx_start + first_track->sidx_length - 1);
	fprintf(out, "\t\t\t</Representation>\n");
	i = j;
	}
	fprintf(out, "\t\t</AdaptationSet>\n");
	}
	fprintf(out, "\t</Period>\n");
	fprintf(out, "</MPD>\n");

	fclose(out);
	err:
	for (i = 0; i < 2; i++)
	av_free(adaptation_sets_buf[i]);
	return ret;
	}

	static void clean_tracks(struct Tracks *tracks)
	{
	int i;
	for (i = 0; i < tracks->nb_tracks; i++) {
	av_freep(&tracks->tracks[i]);
	}
	av_freep(&tracks->tracks);
	tracks->nb_tracks = 0;
	}

	int main(int argc, char **argv)
	{
	const char *out = NULL;
	struct Tracks tracks = { 0 };
	int i;

	for (i = 1; i < argc; i++) {
	if (!strcmp(argv[i], "-out")) {
	out = argv[i + 1];
	i++;
	} else if (argv[i][0] == '-') {
	return usage(argv[0], 1);
	} else {
	if (handle_file(&tracks, argv[i]))
	return 1;
	}
	}
	if (!tracks.nb_tracks \|\| !out)
	return usage(argv[0], 1);

	output_mpd(&tracks, out);

	clean_tracks(&tracks);

	return 0;
	}